Angular DropDownBox API
The DropDownBox widget consists of a text field, which displays the current value, and a drop-down field, which can contain any UI element.
DevExtreme widgets are integrated with many popular libraries and frameworks. See the Installation section (for JavaScript libraries) or the Prerequisites and Installation section (for ASP.NET MVC framework) to find details on setting up DevExtreme with a particular library or framework.
The following code shows how to create the DropDownBox widget using every supported library and framework. For more details on working with widgets in these libraries and frameworks, see the Widget Basics topic for jQuery, Angular, AngularJS, Knockout or ASP.NET MVC.
jQuery
$(function () { var fruits = ["Apples", "Oranges", "Lemons", "Pears", "Pineapples"]; $("#dropDownBox").dxDropDownBox({ value: fruits[0], dataSource: fruits, contentTemplate: function (e) { var $list = $("<div>").dxList({ dataSource: fruits, selectionMode: "single", onSelectionChanged: function (args) { e.component.option("value", args.addedItems[0]); e.component.close(); } }); return $list; } }); });
<div id="dropDownBox"></div>
Angular
<dx-drop-down-box [(value)]="selectedFruit" [(opened)]="isDropDownBoxOpened" [dataSource]="fruits"> <div *dxTemplate="let contentData of 'content'"> <dx-list [dataSource]="fruits" selectionMode="single" (onSelectionChanged)="changeDropDownBoxValue($event)"> </dx-list> </div> </dx-drop-down-box>
import { DxDropDownBoxModule } from "devextreme-angular"; // ... export class AppComponent { fruits = ["Apples", "Oranges", "Lemons", "Pears", "Pineapples"]; selectedFruit = fruits[0]; isDropDownBoxOpened = false; changeDropDownBoxValue = function (args) { selectedFruit = args.addedItems[0]; isDropDownBoxOpened = false; } } @NgModule({ imports: [ // ... DxDropDownBoxModule ], // ... })
AngularJS
<div ng-controller="DemoController"> <div dx-drop-down-box="{ dataSource: fruits, bindingOptions: { value: 'selectedFruit', opened: 'isDropDownBoxOpened' } }"> <div data-options="dxTemplate: { name: 'content' }"> <div dx-list="{ dataSource: fruits, selectionMode: 'single', onSelectionChanged: changeDropDownBoxValue }"></div> </div> </div> </div>
angular.module("DemoApp", ["dx"]) .controller("DemoController", function ($scope) { $scope.fruits = ["Apples", "Oranges", "Lemons", "Pears", "Pineapples"]; $scope.selectedFruit = $scope.fruits[0]; $scope.isDropDownBoxOpened = false; $scope.changeDropDownBoxValue = function (args) { $scope.selectedFruit = args.addedItems[0]; $scope.isDropDownBoxOpened = false; } });
Knockout
<div data-bind="dxDropDownBox: { value: fruits[0], dataSource: fruits, opened: isDropDownBoxOpened }"> <div data-options="dxTemplate: { name: 'content' }"> <div data-bind="dxList: { dataSource: fruits, selectionMode: 'single', onSelectionChanged: changeDropDownBoxValue }"></div> </div> </div>
var viewModel = function () { var vm = { }; vm.fruits = ["Apples", "Oranges", "Lemons", "Pears", "Pineapples"]; vm.selectedFruit = ko.observable(vm.fruits[0]); vm.isDropDownBoxOpened = ko.observable(false); vm.changeDropDownBoxValue = function (args) { vm.selectedFruit(args.addedItems[0]); vm.isDropDownBoxOpened(false); } return vm; }; ko.applyBindings(viewModel);
ASP.NET MVC Controls
@(Html.DevExtreme().DropDownBox() .ID("dropDownBox") .DataSource(new[] { "Apples", "Oranges", "Lemons", "Pears", "Pineapples" }) .Value("Apples") .ContentTemplate(@<text> @(Html.DevExtreme().List() .DataSource(new JS("component.option('dataSource')")) .SelectionMode(ListSelectionMode.Single) .OnSelectionChanged("innerList_selectionChanged") ) </text>) ) <script> function innerList_selectionChanged (e) { var dropDownBox = $("#dropDownBox").dxDropDownBox("instance"); dropDownBox.option("value", e.addedItems[0]); dropDownBox.close(); } </script>
@Code Html.DevExtreme().DropDownBox() _ .ID("dropDownBox") _ .DataSource({ "Apples", "Oranges", "Lemons", "Pears", "Pineapples" }) _ .Value("Apples") _ .ContentTemplate(Sub() @<text> @Html.DevExtreme().List() _ .DataSource(New JS("component.option('dataSource')")) _ .SelectionMode(ListSelectionMode.Single) _ .OnSelectionChanged("innerList_selectionChanged") </text> End Sub).Render() End Code <script> function innerList_selectionChanged (e) { var dropDownBox = $("#dropDownBox").dxDropDownBox("instance"); dropDownBox.option("value", e.addedItems[0]); dropDownBox.close(); } </script>
Properties
Name | Description |
---|---|
acceptCustomValue |
Specifies whether the widget allows a user to enter a custom value. |
accessKey |
Specifies the shortcut key that sets focus on the widget. |
activeStateEnabled |
Specifies whether or not the widget changes its state when interacting with a user. |
contentTemplate |
Specifies a custom template for the drop-down content. |
dataSource |
A data source used to fetch data the widget should display. |
deferRendering |
Specifies whether to render the drop-down field's content when it is displayed. If false, the content is rendered immediately. |
disabled |
Specifies whether the widget responds to user interaction. |
displayExpr |
Specifies the name of the data source item field whose value is displayed by the widget. |
dropDownButtonTemplate |
Specifies a custom template for the drop-down button. |
dropDownOptions |
Configures the drop-down field which holds the content. |
elementAttr |
Specifies the attributes to be attached to the widget's root element. |
fieldTemplate |
Specifies a custom template for the text field. Must contain the TextBox widget. |
focusStateEnabled |
Specifies whether the widget can be focused using keyboard navigation. |
height |
Specifies the widget's height. |
hint |
Specifies text for a hint that appears when a user pauses on the widget. |
hoverStateEnabled |
Specifies whether the widget changes its state when a user pauses on it. |
inputAttr |
Specifies the attributes to be passed on to the underlying HTML element. |
isValid |
Specifies whether the editor's value is valid. |
items |
An array of items displayed by the widget. |
name |
The value to be assigned to the |
onChange |
A function that is executed when the widget loses focus after the content has been changed. |
onClosed |
A function that is executed once the drop-down editor is closed. |
onCopy |
A function that is executed when the widget's input has been copied. |
onCut |
A function that is executed when the widget's input has been cut. |
onDisposing |
A function that is executed before the widget is disposed of. |
onEnterKey |
A function that is executed when the Enter key has been pressed while the widget is focused. |
onFocusIn |
A function that is executed when the widget gets focus. |
onFocusOut |
A function that is executed when the widget loses focus. |
onInitialized |
A function that is executed only once, after the widget is initialized. |
onInput |
A function that is executed each time the widget's input is changed while the widget is focused. |
onKeyDown |
A function that is executed when a user is pressing a key on the keyboard. |
onKeyPress |
A function that is executed when a user presses a key on the keyboard. |
onKeyUp |
A function that is executed when a user releases a key on the keyboard. |
onOpened |
A function that is executed once the drop-down editor is opened. |
onOptionChanged |
A function that is executed after a widget option is changed. |
onPaste |
A function that is executed when the widget's input has been pasted. |
onValueChanged |
A function that is executed after the widget's value is changed. |
opened |
Specifies whether or not the drop-down editor is displayed. |
placeholder |
The text displayed by the widget when the widget value is empty. |
readOnly |
A Boolean value specifying whether or not the widget is read-only. |
rtlEnabled |
Switches the widget to a right-to-left representation. |
showClearButton |
Specifies whether to display the Clear button in the widget. |
showDropDownButton |
Specifies whether to show the drop-down button. |
tabIndex |
Specifies the number of the element when the Tab key is used for navigating. |
text |
The read-only option that holds the text displayed by the widget input element. |
validationError |
Specifies information on the validation error when using a custom validation engine. Should be changed at runtime along with the isValid option. |
validationMessageMode |
Specifies how the message about the validation rules that are not satisfied by this editor's value is displayed. |
value |
Specifies the currently selected value. May be an object if dataSource contains objects and valueExpr is not set. |
valueChangeEvent |
Specifies the DOM events after which the widget's value should be updated. |
valueExpr |
Specifies which data field provides the widget's value. When this option is not set, the value is the entire data object. |
visible |
Specifies whether the widget is visible. |
width |
Specifies the widget's width. |
Methods
Name | Description |
---|---|
beginUpdate() |
Prevents the widget from refreshing until the endUpdate() method is called. |
blur() |
Removes focus from the input element. |
close() |
Closes the drop-down editor. |
content() |
Gets the popup window's content. |
defaultOptions(rule) |
Specifies the device-dependent default configuration options for this component. |
dispose() |
Disposes of all the resources allocated to the DropDownBox instance. |
element() |
Gets the root widget element. |
endUpdate() |
Refreshes the widget after a call of the beginUpdate() method. |
field() |
Gets the widget's |
focus() |
Sets focus to the input element representing the widget. |
getDataSource() |
Gets the DataSource instance. |
getInstance(element) |
Gets the instance of a widget found using its DOM node. |
instance() |
Gets the widget's instance. Use it to access other methods of the widget. |
off(eventName) |
Detaches all event handlers from a single event. |
off(eventName, eventHandler) |
Detaches a particular event handler from a single event. |
on(eventName, eventHandler) |
Subscribes to an event. |
on(events) |
Subscribes to events. |
open() |
Opens the drop-down editor. |
option() |
Gets all widget options. |
option(optionName) |
Gets the value of a single option. |
option(optionName, optionValue) |
Updates the value of a single option. |
option(options) |
Updates the values of several options. |
registerKeyHandler(key, handler) |
Registers a handler to be executed when a user presses a specific key. |
repaint() |
Repaints the widget without reloading data. Call it to update the widget's markup. |
reset() |
Resets the value option to the default value. |
Events
Name | Description |
---|---|
change |
Raised when the element loses focus after the content has been changed. |
closed |
Raised once the drop-down editor is closed. |
copy |
Raised when the widget's input has been copied. |
cut |
Raised when the widget's input has been cut. |
disposing |
Raised before the widget is disposed of. |
enterKey |
Raised when the Enter key has been pressed while the widget is focused. |
focusIn |
Raised when the widget gets focus. |
focusOut |
Raised when the widget loses focus. |
initialized |
Raised only once, after the widget is initialized. |
input |
Raised each time the widget's input is changed while the widget is focused. |
keyDown |
Raised when a user is pressing a key on the keyboard. |
keyPress |
Raised when a user presses a key on the keyboard. |
keyUp |
Raised when a user releases a key on the keyboard. |
opened |
Raised once the drop-down editor is opened. |
optionChanged |
Raised after a widget option is changed. |
paste |
Raised when the widget's input has been pasted. |
valueChanged |
Raised after the widget's value is changed. |
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